GB1108619A - Improvements in or relating to a method and circuit for controlling the gain of a short-wave receiver - Google Patents
Improvements in or relating to a method and circuit for controlling the gain of a short-wave receiverInfo
- Publication number
- GB1108619A GB1108619A GB49656/66A GB4965666A GB1108619A GB 1108619 A GB1108619 A GB 1108619A GB 49656/66 A GB49656/66 A GB 49656/66A GB 4965666 A GB4965666 A GB 4965666A GB 1108619 A GB1108619 A GB 1108619A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rectifier
- feeds
- amplifier
- stages
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000003111 delayed effect Effects 0.000 abstract 1
- 238000009499 grossing Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 230000001629 suppression Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
Landscapes
- Amplifiers (AREA)
- Noise Elimination (AREA)
- Toys (AREA)
Abstract
1,108,619. Automatic gain control; interference suppression in radio receivers. ANSTALT EUROPAISCHE HANDELSGESELLSCHAFT. 4 Nov., 1966 [19 Nov., 1965], No. 49656/66. Heading H3Q, H4L and H4R. In a short wave receiver having a bandwidth covering a number of pulse communication channels, automatic gain control is applied individually to each channel after separation out from the band. The arrangement is described as applied to a receiver comprising R.F. stages 2, 7 feeding into a first mixer 11, which is followed by branched I.F. amplifiers 12, 17. I.F. amplifier 12 feeds a rectifier 13, the smoothed D.C. output of which is amplified in amplifier 5 and applied to heater coils 4, 9 associated with thermally-variable resistors 3, 8 respectively. Resistors 3, 8 are connected, in series with D.C. blocking capacitors, between the anodes and grids of valves 2, 7 respectively and so provide variable negative feedback, controlling the gain of the R.F. stages. I. F. amplifier 12 also feeds two further rectifiers 14, 15; rectifier 14 feeds into a smoothing network such that its output follows the signal level, and provides a delay bias for rectifier 15 which only becomes conductive on noise pulses exceeding the signal level. On such noise pulses a bias is applied to the outer grid of valve 17 causing it to be cut-off for the duration of the noise pulse. Valve 17 feeds via I.F. filter 18 into a second mixer 19, from the output of which the various communication channels are separated out by means of filters 20a, b, c &c. Each channel comprises an R.C. coupled amplifier comprising cascaded stages 21, 22, 23: the output of stage 22 is rectified by rectifier 29, delayed by delay diode 32 and applied as automatic gain control to bias back stages, 21, 22. The cathode circuit of each of these valves comprises a Zener diode 24, 25 respectively; as the current through the corresponding valve is decreased, the Zener diode increases in impedance and so increases the amount of negative feedback, so reducing the gain.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1594965A CH427927A (en) | 1965-11-19 | 1965-11-19 | Method for gain control in shortwave reception |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1108619A true GB1108619A (en) | 1968-04-03 |
Family
ID=4413278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB49656/66A Expired GB1108619A (en) | 1965-11-19 | 1966-11-04 | Improvements in or relating to a method and circuit for controlling the gain of a short-wave receiver |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3496472A (en) |
| AT (1) | AT285678B (en) |
| CH (1) | CH427927A (en) |
| DE (1) | DE1541430A1 (en) |
| GB (1) | GB1108619A (en) |
| NL (1) | NL6615804A (en) |
| NO (1) | NO125609B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2705321A (en) * | 1949-06-29 | 1955-03-29 | Wing Engineering Corp | Percentage modulation system for proportional control |
| US2695927A (en) * | 1951-12-29 | 1954-11-30 | Bell Telephone Labor Inc | Multichannel carrier telephone system |
| US3042800A (en) * | 1960-07-01 | 1962-07-03 | Hughes Aircraft Co | Selective automatic gain control circuit |
| US3109989A (en) * | 1961-09-19 | 1963-11-05 | Bell Telephone Labor Inc | Automatic gain control circuit using plural time constant means |
-
1965
- 1965-11-19 CH CH1594965A patent/CH427927A/en unknown
-
1966
- 1966-10-29 DE DE19661541430 patent/DE1541430A1/en active Pending
- 1966-11-04 AT AT1022766A patent/AT285678B/en active
- 1966-11-04 GB GB49656/66A patent/GB1108619A/en not_active Expired
- 1966-11-09 NL NL6615804A patent/NL6615804A/xx unknown
- 1966-11-14 US US594240A patent/US3496472A/en not_active Expired - Lifetime
- 1966-11-15 NO NO165592A patent/NO125609B/no unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE1541430A1 (en) | 1969-07-17 |
| CH427927A (en) | 1967-01-15 |
| US3496472A (en) | 1970-02-17 |
| NL6615804A (en) | 1967-05-22 |
| AT285678B (en) | 1970-11-10 |
| NO125609B (en) | 1972-10-02 |
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